package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

//true
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类
     * @param id
     */
    @Override
    public void remove(Long id) {
        //根据分类id查询菜品
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper=new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);
        //关联计数
        int countC=dishService.count(dishLambdaQueryWrapper);
        //如果分类已关联菜品,抛出异常
        if(countC>0){
            throw new CustomException("当前分类下关联了菜品,不能删除!");
        }
        //根据分类id查询套餐
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper=new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        //关联计数
        int countT=setmealService.count(setmealLambdaQueryWrapper);
        //如果套餐已关联菜品,抛出异常
        if(countT>0){
            throw new CustomException("当前分类下关联了套餐,不能删除!");
        }
        //正常删除分类
        super.removeById(id);
    }
}
